PHILADELPHIA (AP) — Democrat Tom Wolf is being endorsed for governor by one of Pennsylvania’s largest labor unions while the man he’s challenging, Republican Gov. Tom Corbett, is fundraising with New Jersey Gov. Chris Christie.

Wolf was to appear Friday morning outside Philadelphia City Hall with members of Service Employees International Union. On Friday afternoon, Corbett’s attending a private fundraiser for the Republican Governors Association with Christie at the downtown Pittsburgh Omni William Penn Hotel.

After that, the men will head to the popular Primanti Bros. restaurant. The Republican Governors Association is Corbett’s biggest campaign donor.

The election is Nov. 4. Early polling showing Corbett far behind Wolf, the wealthy York County businessman who is making his first bid for public office.